| Elastic Modulus and Hardness of Cr-Nb Nano-Multilayers |
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| 作者姓名： | 杨孟锦 赖文生 潘峰 |
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| 作者单位： | Laboratory of Advanced Materials, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084 |
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| 基金项目： | Supported by the National Natural Science Foundation of China under Grant Nos 50471010 and 50531040, and the Programme for New Century Excellent Talents in University, Ministry of Education of China. |
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| 摘 要： | Cr-Nb nano-multilayered films with various modulation wavelengths A are prepared by e-gun evaporation and their mechanical properties are investigated. Cr and Nb both have bcc structures with large differences in lattice constants and Young＇s modulus, which are supposed to favour modulus enhancement. Nevertheless, nano-indention measurements show no enhancement for the modulus and a slight decrease for the hardness with decreasing A down to 5 nm. This is mainly due to counter-contribution to modulus from adjacent layers subjected to reverse strains, in agreement with recent theoretical study, while the decrease of hardness arises from grain boundary sliding. Interestingly, at A = 3 nm, the hardness of the film has an increase of 44% relative to the value of a rule of mixture, owing to the emergence of a new phase for reconciling the structure difference at the interfaces.
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| 关 键 词： | 弹性系数 硬度 Cr-Nb 多层分子 波长 |
| 收稿时间： | 2007-2-6 |
| 修稿时间： | 2007-02-06 |
Elastic Modulus and Hardness of Cr--Nb Nano-Multilayers |
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| YANG Meng-Jin,LAI Wen-Sheng,PAN Feng.Elastic Modulus and Hardness of Cr-Nb Nano-Multilayers[J].Chinese Physics Letters,2007,24(9):2635-2638. |
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| Authors: | YANG Meng-Jin LAI Wen-Sheng PAN Feng |
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| Institution: | Laboratory of Advanced Materials, Department of Materials Science and Engineering, Tsinghua University, Beijing 100084 |
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| Abstract: | |
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| Keywords: | 62 25 +g 68 65 -k 68 65 Ac |
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